Strong room-temperature blue-violet photoluminescence of multiferroic BaMnF₄

Abstract

Abstract:BaMnF4 microsheets have been prepared by hydrothermal method. Strong room-temperature blue-violet photoluminescence has been observed (absolute luminescence quantum yield 67%), with two peaks located at 385 nm and 410 nm, respectively. More interestingly, photon self-absorption phenomenon has been observed, leading to unusual abrupt drop of luminescence intensity at wavelength of 400 nm. To understand the underlying mechanism of such emitting, the electronic structure of BaMnF4 has been studied by first

BaMF4 (M = Mn, Co, Ni): New electrode materials for hybrid supercapacitor with layered polar structure

“…S2, BaMnF4 powders show the sheet structure, with typical lateral size in the order of 10 μm. Our previous transmission electron microscope (TEM) data confirmed that each BaMnF4 sheet were grown in the ac plane, corresponding to the layered structure [28]. Although the SEM images of other two BaMF4 (M = Co and Ni) (Fig.…”

“…BaMF4 (M = Mn, Co, Ni) powders were synthesized using hydrothermal method, and finally resulted in pale pink, rose red, and golden yellow powders for M = Mn, Co, and Ni, respectively [28][29][30]. To prepare the electrodes, the electroactive materials BaMF4 were mixed with acetylene black and polyvinylidene fluoride (PVDF) with a mass ratio of 8:1:1, and then fully milled with N-methyl-2-pyrrolidone (NMP).…”

The wasp-waisted hysteresis loop and exchange bias in multiferroic BaNiF4

“…9,10 The mixture of BaF 2 and Ni(CH 3 COO) 2 ·4H 2 O with stoichiometric ratio were dissolved in trifluoroacetic acid solution (volume ratio 1:1 for CF 3 COOH and distilled water), enclosed into 23 mL autoclave, heated to 220 • C and held for 20 hours, then slowly cooled down to room temperature. The obtained precipitates were cleaned by ethanol and distilled water, and dried in vacuum oven at 95 • C for 6 hours, resulting in the final yellow powder.…”

Single-phase multiferroics: new materials, phenomena, and physics

“…However, the AFM ordering usually emerges at a much lower temperature, typically T N < 50 K. It should be mentioned that multiferroic fluorides have been less addressed as compared with other type-I multiferroics, perhaps due to the difficulties in synthesis of high-quality materials and electric characterization. In addition, strong room-temperature blue–violet photoluminescence in BaMnF 4 was found very recently [ 42 ], a surprising functionality in multiferroic fluorides.…”